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django/tests/migrations/test_state.py

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from django.apps.registry import Apps
from django.contrib.contenttypes.fields import GenericForeignKey
from django.db import models
from django.db.migrations.exceptions import InvalidBasesError
from django.db.migrations.operations import (
AddField,
AlterField,
DeleteModel,
RemoveField,
)
from django.db.migrations.state import (
ModelState,
ProjectState,
get_related_models_recursive,
)
from django.test import SimpleTestCase, override_settings
from django.test.utils import isolate_apps
from .models import (
FoodManager,
FoodQuerySet,
ModelWithCustomBase,
NoMigrationFoodManager,
UnicodeModel,
)
class StateTests(SimpleTestCase):
"""
Tests state construction, rendering and modification by operations.
"""
def test_create(self):
"""
Tests making a ProjectState from an Apps
"""
new_apps = Apps(["migrations"])
class Author(models.Model):
name = models.CharField(max_length=255)
bio = models.TextField()
age = models.IntegerField(blank=True, null=True)
class Meta:
app_label = "migrations"
apps = new_apps
unique_together = ["name", "bio"]
index_together = ["bio", "age"]
class AuthorProxy(Author):
class Meta:
app_label = "migrations"
apps = new_apps
proxy = True
ordering = ["name"]
class SubAuthor(Author):
width = models.FloatField(null=True)
class Meta:
app_label = "migrations"
apps = new_apps
class Book(models.Model):
title = models.CharField(max_length=1000)
author = models.ForeignKey(Author, models.CASCADE)
contributors = models.ManyToManyField(Author)
class Meta:
app_label = "migrations"
apps = new_apps
verbose_name = "tome"
db_table = "test_tome"
indexes = [models.Index(fields=["title"])]
class Food(models.Model):
food_mgr = FoodManager("a", "b")
food_qs = FoodQuerySet.as_manager()
food_no_mgr = NoMigrationFoodManager("x", "y")
class Meta:
app_label = "migrations"
apps = new_apps
class FoodNoManagers(models.Model):
class Meta:
app_label = "migrations"
apps = new_apps
class FoodNoDefaultManager(models.Model):
food_no_mgr = NoMigrationFoodManager("x", "y")
food_mgr = FoodManager("a", "b")
food_qs = FoodQuerySet.as_manager()
class Meta:
app_label = "migrations"
apps = new_apps
mgr1 = FoodManager("a", "b")
mgr2 = FoodManager("x", "y", c=3, d=4)
class FoodOrderedManagers(models.Model):
# The managers on this model should be ordered by their creation
# counter and not by the order in model body
food_no_mgr = NoMigrationFoodManager("x", "y")
food_mgr2 = mgr2
food_mgr1 = mgr1
class Meta:
app_label = "migrations"
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models["migrations", "author"]
author_proxy_state = project_state.models["migrations", "authorproxy"]
sub_author_state = project_state.models["migrations", "subauthor"]
book_state = project_state.models["migrations", "book"]
food_state = project_state.models["migrations", "food"]
food_no_managers_state = project_state.models["migrations", "foodnomanagers"]
food_no_default_manager_state = project_state.models[
"migrations", "foodnodefaultmanager"
]
food_order_manager_state = project_state.models[
"migrations", "foodorderedmanagers"
]
book_index = models.Index(fields=["title"])
book_index.set_name_with_model(Book)
self.assertEqual(author_state.app_label, "migrations")
self.assertEqual(author_state.name, "Author")
self.assertEqual(list(author_state.fields), ["id", "name", "bio", "age"])
self.assertEqual(author_state.fields["name"].max_length, 255)
self.assertIs(author_state.fields["bio"].null, False)
self.assertIs(author_state.fields["age"].null, True)
self.assertEqual(
author_state.options,
{
"unique_together": {("name", "bio")},
"index_together": {("bio", "age")},
"indexes": [],
"constraints": [],
},
)
self.assertEqual(author_state.bases, (models.Model,))
self.assertEqual(book_state.app_label, "migrations")
self.assertEqual(book_state.name, "Book")
self.assertEqual(
list(book_state.fields), ["id", "title", "author", "contributors"]
)
self.assertEqual(book_state.fields["title"].max_length, 1000)
self.assertIs(book_state.fields["author"].null, False)
self.assertEqual(
book_state.fields["contributors"].__class__.__name__, "ManyToManyField"
)
self.assertEqual(
book_state.options,
{
"verbose_name": "tome",
"db_table": "test_tome",
"indexes": [book_index],
"constraints": [],
},
)
self.assertEqual(book_state.bases, (models.Model,))
self.assertEqual(author_proxy_state.app_label, "migrations")
self.assertEqual(author_proxy_state.name, "AuthorProxy")
self.assertEqual(author_proxy_state.fields, {})
self.assertEqual(
author_proxy_state.options,
{"proxy": True, "ordering": ["name"], "indexes": [], "constraints": []},
)
self.assertEqual(author_proxy_state.bases, ("migrations.author",))
self.assertEqual(sub_author_state.app_label, "migrations")
self.assertEqual(sub_author_state.name, "SubAuthor")
self.assertEqual(len(sub_author_state.fields), 2)
self.assertEqual(sub_author_state.bases, ("migrations.author",))
# The default manager is used in migrations
self.assertEqual([name for name, mgr in food_state.managers], ["food_mgr"])
self.assertTrue(all(isinstance(name, str) for name, mgr in food_state.managers))
self.assertEqual(food_state.managers[0][1].args, ("a", "b", 1, 2))
# No explicit managers defined. Migrations will fall back to the default
self.assertEqual(food_no_managers_state.managers, [])
# food_mgr is used in migration but isn't the default mgr, hence add the
# default
self.assertEqual(
[name for name, mgr in food_no_default_manager_state.managers],
["food_no_mgr", "food_mgr"],
)
self.assertTrue(
all(
isinstance(name, str)
for name, mgr in food_no_default_manager_state.managers
)
)
self.assertEqual(
food_no_default_manager_state.managers[0][1].__class__, models.Manager
)
self.assertIsInstance(food_no_default_manager_state.managers[1][1], FoodManager)
self.assertEqual(
[name for name, mgr in food_order_manager_state.managers],
["food_mgr1", "food_mgr2"],
)
self.assertTrue(
all(
isinstance(name, str) for name, mgr in food_order_manager_state.managers
)
)
self.assertEqual(
[mgr.args for name, mgr in food_order_manager_state.managers],
[("a", "b", 1, 2), ("x", "y", 3, 4)],
)
def test_custom_default_manager_added_to_the_model_state(self):
"""
When the default manager of the model is a custom manager,
it needs to be added to the model state.
"""
new_apps = Apps(["migrations"])
custom_manager = models.Manager()
class Author(models.Model):
objects = models.TextField()
authors = custom_manager
class Meta:
app_label = "migrations"
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models["migrations", "author"]
self.assertEqual(author_state.managers, [("authors", custom_manager)])
def test_custom_default_manager_named_objects_with_false_migration_flag(self):
"""
When a manager is added with a name of 'objects' but it does not
have `use_in_migrations = True`, no migration should be added to the
model state (#26643).
"""
new_apps = Apps(["migrations"])
class Author(models.Model):
objects = models.Manager()
class Meta:
app_label = "migrations"
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models["migrations", "author"]
self.assertEqual(author_state.managers, [])
def test_no_duplicate_managers(self):
"""
When a manager is added with `use_in_migrations = True` and a parent
model had a manager with the same name and `use_in_migrations = True`,
the parent's manager shouldn't appear in the model state (#26881).
"""
new_apps = Apps(["migrations"])
class PersonManager(models.Manager):
use_in_migrations = True
class Person(models.Model):
objects = PersonManager()
class Meta:
abstract = True
class BossManager(PersonManager):
use_in_migrations = True
class Boss(Person):
objects = BossManager()
class Meta:
app_label = "migrations"
apps = new_apps
project_state = ProjectState.from_apps(new_apps)
boss_state = project_state.models["migrations", "boss"]
self.assertEqual(boss_state.managers, [("objects", Boss.objects)])
def test_custom_default_manager(self):
new_apps = Apps(["migrations"])
class Author(models.Model):
manager1 = models.Manager()
manager2 = models.Manager()
class Meta:
app_label = "migrations"
apps = new_apps
default_manager_name = "manager2"
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models["migrations", "author"]
self.assertEqual(author_state.options["default_manager_name"], "manager2")
self.assertEqual(author_state.managers, [("manager2", Author.manager1)])
def test_custom_base_manager(self):
new_apps = Apps(["migrations"])
class Author(models.Model):
manager1 = models.Manager()
manager2 = models.Manager()
class Meta:
app_label = "migrations"
apps = new_apps
base_manager_name = "manager2"
class Author2(models.Model):
manager1 = models.Manager()
manager2 = models.Manager()
class Meta:
app_label = "migrations"
apps = new_apps
base_manager_name = "manager1"
project_state = ProjectState.from_apps(new_apps)
author_state = project_state.models["migrations", "author"]
self.assertEqual(author_state.options["base_manager_name"], "manager2")
self.assertEqual(
author_state.managers,
[
("manager1", Author.manager1),
("manager2", Author.manager2),
],
)
author2_state = project_state.models["migrations", "author2"]
self.assertEqual(author2_state.options["base_manager_name"], "manager1")
self.assertEqual(
author2_state.managers,
[
("manager1", Author2.manager1),
],
)
def test_apps_bulk_update(self):
"""
StateApps.bulk_update() should update apps.ready to False and reset
the value afterward.
"""
project_state = ProjectState()
apps = project_state.apps
with apps.bulk_update():
self.assertFalse(apps.ready)
self.assertTrue(apps.ready)
with self.assertRaises(ValueError):
with apps.bulk_update():
self.assertFalse(apps.ready)
raise ValueError()
self.assertTrue(apps.ready)
def test_render(self):
"""
Tests rendering a ProjectState into an Apps.
"""
project_state = ProjectState()
project_state.add_model(
ModelState(
app_label="migrations",
name="Tag",
fields=[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
("hidden", models.BooleanField()),
],
)
)
project_state.add_model(
ModelState(
app_label="migrations",
name="SubTag",
fields=[
(
"tag_ptr",
models.OneToOneField(
"migrations.Tag",
models.CASCADE,
auto_created=True,
parent_link=True,
primary_key=True,
to_field="id",
serialize=False,
),
),
("awesome", models.BooleanField()),
],
bases=("migrations.Tag",),
)
)
base_mgr = models.Manager()
mgr1 = FoodManager("a", "b")
mgr2 = FoodManager("x", "y", c=3, d=4)
project_state.add_model(
ModelState(
app_label="migrations",
name="Food",
fields=[
("id", models.AutoField(primary_key=True)),
],
managers=[
# The ordering we really want is objects, mgr1, mgr2
("default", base_mgr),
("food_mgr2", mgr2),
("food_mgr1", mgr1),
],
)
)
new_apps = project_state.apps
self.assertEqual(
new_apps.get_model("migrations", "Tag")._meta.get_field("name").max_length,
100,
)
self.assertIs(
new_apps.get_model("migrations", "Tag")._meta.get_field("hidden").null,
False,
)
self.assertEqual(
len(new_apps.get_model("migrations", "SubTag")._meta.local_fields), 2
)
Food = new_apps.get_model("migrations", "Food")
self.assertEqual(
[mgr.name for mgr in Food._meta.managers],
["default", "food_mgr1", "food_mgr2"],
)
self.assertTrue(all(isinstance(mgr.name, str) for mgr in Food._meta.managers))
self.assertEqual(
[mgr.__class__ for mgr in Food._meta.managers],
[models.Manager, FoodManager, FoodManager],
)
def test_render_model_inheritance(self):
class Book(models.Model):
title = models.CharField(max_length=1000)
class Meta:
app_label = "migrations"
apps = Apps()
class Novel(Book):
class Meta:
app_label = "migrations"
apps = Apps()
# First, test rendering individually
apps = Apps(["migrations"])
# We shouldn't be able to render yet
ms = ModelState.from_model(Novel)
with self.assertRaises(InvalidBasesError):
ms.render(apps)
# Once the parent model is in the app registry, it should be fine
ModelState.from_model(Book).render(apps)
ModelState.from_model(Novel).render(apps)
def test_render_model_with_multiple_inheritance(self):
class Foo(models.Model):
class Meta:
app_label = "migrations"
apps = Apps()
class Bar(models.Model):
class Meta:
app_label = "migrations"
apps = Apps()
class FooBar(Foo, Bar):
class Meta:
app_label = "migrations"
apps = Apps()
class AbstractSubFooBar(FooBar):
class Meta:
abstract = True
apps = Apps()
class SubFooBar(AbstractSubFooBar):
class Meta:
app_label = "migrations"
apps = Apps()
apps = Apps(["migrations"])
# We shouldn't be able to render yet
ms = ModelState.from_model(FooBar)
with self.assertRaises(InvalidBasesError):
ms.render(apps)
# Once the parent models are in the app registry, it should be fine
ModelState.from_model(Foo).render(apps)
self.assertSequenceEqual(ModelState.from_model(Foo).bases, [models.Model])
ModelState.from_model(Bar).render(apps)
self.assertSequenceEqual(ModelState.from_model(Bar).bases, [models.Model])
ModelState.from_model(FooBar).render(apps)
self.assertSequenceEqual(
ModelState.from_model(FooBar).bases, ["migrations.foo", "migrations.bar"]
)
ModelState.from_model(SubFooBar).render(apps)
self.assertSequenceEqual(
ModelState.from_model(SubFooBar).bases, ["migrations.foobar"]
)
def test_render_project_dependencies(self):
"""
The ProjectState render method correctly renders models
to account for inter-model base dependencies.
"""
new_apps = Apps()
class A(models.Model):
class Meta:
app_label = "migrations"
apps = new_apps
class B(A):
class Meta:
app_label = "migrations"
apps = new_apps
class C(B):
class Meta:
app_label = "migrations"
apps = new_apps
class D(A):
class Meta:
app_label = "migrations"
apps = new_apps
class E(B):
class Meta:
app_label = "migrations"
apps = new_apps
proxy = True
class F(D):
class Meta:
app_label = "migrations"
apps = new_apps
proxy = True
# Make a ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
project_state.add_model(ModelState.from_model(C))
project_state.add_model(ModelState.from_model(D))
project_state.add_model(ModelState.from_model(E))
project_state.add_model(ModelState.from_model(F))
final_apps = project_state.apps
self.assertEqual(len(final_apps.get_models()), 6)
# Now make an invalid ProjectState and make sure it fails
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
project_state.add_model(ModelState.from_model(C))
project_state.add_model(ModelState.from_model(F))
with self.assertRaises(InvalidBasesError):
project_state.apps
def test_render_unique_app_labels(self):
"""
The ProjectState render method doesn't raise an
ImproperlyConfigured exception about unique labels if two dotted app
names have the same last part.
"""
class A(models.Model):
class Meta:
app_label = "django.contrib.auth"
class B(models.Model):
class Meta:
app_label = "vendor.auth"
# Make a ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
self.assertEqual(len(project_state.apps.get_models()), 2)
def test_reload_related_model_on_non_relational_fields(self):
"""
The model is reloaded even on changes that are not involved in
relations. Other models pointing to or from it are also reloaded.
"""
project_state = ProjectState()
project_state.apps # Render project state.
project_state.add_model(ModelState("migrations", "A", []))
project_state.add_model(
ModelState(
"migrations",
"B",
[
("a", models.ForeignKey("A", models.CASCADE)),
],
)
)
project_state.add_model(
ModelState(
"migrations",
"C",
[
("b", models.ForeignKey("B", models.CASCADE)),
("name", models.TextField()),
],
)
)
project_state.add_model(
ModelState(
"migrations",
"D",
[
("a", models.ForeignKey("A", models.CASCADE)),
],
)
)
operation = AlterField(
model_name="C",
name="name",
field=models.TextField(blank=True),
)
operation.state_forwards("migrations", project_state)
project_state.reload_model("migrations", "a", delay=True)
A = project_state.apps.get_model("migrations.A")
B = project_state.apps.get_model("migrations.B")
D = project_state.apps.get_model("migrations.D")
self.assertIs(B._meta.get_field("a").related_model, A)
self.assertIs(D._meta.get_field("a").related_model, A)
def test_reload_model_relationship_consistency(self):
project_state = ProjectState()
project_state.add_model(ModelState("migrations", "A", []))
project_state.add_model(
ModelState(
"migrations",
"B",
[
("a", models.ForeignKey("A", models.CASCADE)),
],
)
)
project_state.add_model(
ModelState(
"migrations",
"C",
[
("b", models.ForeignKey("B", models.CASCADE)),
],
)
)
A = project_state.apps.get_model("migrations.A")
B = project_state.apps.get_model("migrations.B")
C = project_state.apps.get_model("migrations.C")
self.assertEqual([r.related_model for r in A._meta.related_objects], [B])
self.assertEqual([r.related_model for r in B._meta.related_objects], [C])
self.assertEqual([r.related_model for r in C._meta.related_objects], [])
project_state.reload_model("migrations", "a", delay=True)
A = project_state.apps.get_model("migrations.A")
B = project_state.apps.get_model("migrations.B")
C = project_state.apps.get_model("migrations.C")
self.assertEqual([r.related_model for r in A._meta.related_objects], [B])
self.assertEqual([r.related_model for r in B._meta.related_objects], [C])
self.assertEqual([r.related_model for r in C._meta.related_objects], [])
def test_add_relations(self):
"""
#24573 - Adding relations to existing models should reload the
referenced models too.
"""
new_apps = Apps()
class A(models.Model):
class Meta:
app_label = "something"
apps = new_apps
class B(A):
class Meta:
app_label = "something"
apps = new_apps
class C(models.Model):
class Meta:
app_label = "something"
apps = new_apps
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
project_state.add_model(ModelState.from_model(C))
project_state.apps # We need to work with rendered models
old_state = project_state.clone()
model_a_old = old_state.apps.get_model("something", "A")
model_b_old = old_state.apps.get_model("something", "B")
model_c_old = old_state.apps.get_model("something", "C")
# The relations between the old models are correct
self.assertIs(model_a_old._meta.get_field("b").related_model, model_b_old)
self.assertIs(model_b_old._meta.get_field("a_ptr").related_model, model_a_old)
operation = AddField(
"c",
"to_a",
models.OneToOneField(
"something.A",
models.CASCADE,
related_name="from_c",
),
)
operation.state_forwards("something", project_state)
model_a_new = project_state.apps.get_model("something", "A")
model_b_new = project_state.apps.get_model("something", "B")
model_c_new = project_state.apps.get_model("something", "C")
# All models have changed
self.assertIsNot(model_a_old, model_a_new)
self.assertIsNot(model_b_old, model_b_new)
self.assertIsNot(model_c_old, model_c_new)
# The relations between the old models still hold
self.assertIs(model_a_old._meta.get_field("b").related_model, model_b_old)
self.assertIs(model_b_old._meta.get_field("a_ptr").related_model, model_a_old)
# The relations between the new models correct
self.assertIs(model_a_new._meta.get_field("b").related_model, model_b_new)
self.assertIs(model_b_new._meta.get_field("a_ptr").related_model, model_a_new)
self.assertIs(model_a_new._meta.get_field("from_c").related_model, model_c_new)
self.assertIs(model_c_new._meta.get_field("to_a").related_model, model_a_new)
def test_remove_relations(self):
"""
#24225 - Relations between models are updated while
remaining the relations and references for models of an old state.
"""
new_apps = Apps()
class A(models.Model):
class Meta:
app_label = "something"
apps = new_apps
class B(models.Model):
to_a = models.ForeignKey(A, models.CASCADE)
class Meta:
app_label = "something"
apps = new_apps
def get_model_a(state):
return [
mod for mod in state.apps.get_models() if mod._meta.model_name == "a"
][0]
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
self.assertEqual(len(get_model_a(project_state)._meta.related_objects), 1)
old_state = project_state.clone()
operation = RemoveField("b", "to_a")
operation.state_forwards("something", project_state)
# Model from old_state still has the relation
model_a_old = get_model_a(old_state)
model_a_new = get_model_a(project_state)
self.assertIsNot(model_a_old, model_a_new)
self.assertEqual(len(model_a_old._meta.related_objects), 1)
self.assertEqual(len(model_a_new._meta.related_objects), 0)
# Same test for deleted model
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
project_state.add_model(ModelState.from_model(B))
old_state = project_state.clone()
operation = DeleteModel("b")
operation.state_forwards("something", project_state)
model_a_old = get_model_a(old_state)
model_a_new = get_model_a(project_state)
self.assertIsNot(model_a_old, model_a_new)
self.assertEqual(len(model_a_old._meta.related_objects), 1)
self.assertEqual(len(model_a_new._meta.related_objects), 0)
def test_self_relation(self):
"""
#24513 - Modifying an object pointing to itself would cause it to be
rendered twice and thus breaking its related M2M through objects.
"""
class A(models.Model):
to_a = models.ManyToManyField("something.A", symmetrical=False)
class Meta:
app_label = "something"
def get_model_a(state):
return [
mod for mod in state.apps.get_models() if mod._meta.model_name == "a"
][0]
project_state = ProjectState()
project_state.add_model(ModelState.from_model(A))
self.assertEqual(len(get_model_a(project_state)._meta.related_objects), 1)
old_state = project_state.clone()
operation = AlterField(
model_name="a",
name="to_a",
field=models.ManyToManyField("something.A", symmetrical=False, blank=True),
)
# At this point the model would be rendered twice causing its related
# M2M through objects to point to an old copy and thus breaking their
# attribute lookup.
operation.state_forwards("something", project_state)
model_a_old = get_model_a(old_state)
model_a_new = get_model_a(project_state)
self.assertIsNot(model_a_old, model_a_new)
# The old model's _meta is still consistent
field_to_a_old = model_a_old._meta.get_field("to_a")
self.assertEqual(field_to_a_old.m2m_field_name(), "from_a")
self.assertEqual(field_to_a_old.m2m_reverse_field_name(), "to_a")
self.assertIs(field_to_a_old.related_model, model_a_old)
self.assertIs(
field_to_a_old.remote_field.through._meta.get_field("to_a").related_model,
model_a_old,
)
self.assertIs(
field_to_a_old.remote_field.through._meta.get_field("from_a").related_model,
model_a_old,
)
# The new model's _meta is still consistent
field_to_a_new = model_a_new._meta.get_field("to_a")
self.assertEqual(field_to_a_new.m2m_field_name(), "from_a")
self.assertEqual(field_to_a_new.m2m_reverse_field_name(), "to_a")
self.assertIs(field_to_a_new.related_model, model_a_new)
self.assertIs(
field_to_a_new.remote_field.through._meta.get_field("to_a").related_model,
model_a_new,
)
self.assertIs(
field_to_a_new.remote_field.through._meta.get_field("from_a").related_model,
model_a_new,
)
def test_equality(self):
"""
== and != are implemented correctly.
"""
# Test two things that should be equal
project_state = ProjectState()
project_state.add_model(
ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
("hidden", models.BooleanField()),
],
{},
None,
)
)
project_state.apps # Fill the apps cached property
other_state = project_state.clone()
self.assertEqual(project_state, project_state)
self.assertEqual(project_state, other_state)
self.assertIs(project_state != project_state, False)
self.assertIs(project_state != other_state, False)
self.assertNotEqual(project_state.apps, other_state.apps)
# Make a very small change (max_len 99) and see if that affects it
project_state = ProjectState()
project_state.add_model(
ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=99)),
("hidden", models.BooleanField()),
],
{},
None,
)
)
self.assertNotEqual(project_state, other_state)
self.assertIs(project_state == other_state, False)
def test_dangling_references_throw_error(self):
new_apps = Apps()
class Author(models.Model):
name = models.TextField()
class Meta:
app_label = "migrations"
apps = new_apps
class Publisher(models.Model):
name = models.TextField()
class Meta:
app_label = "migrations"
apps = new_apps
class Book(models.Model):
author = models.ForeignKey(Author, models.CASCADE)
publisher = models.ForeignKey(Publisher, models.CASCADE)
class Meta:
app_label = "migrations"
apps = new_apps
class Magazine(models.Model):
authors = models.ManyToManyField(Author)
class Meta:
app_label = "migrations"
apps = new_apps
# Make a valid ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Author))
project_state.add_model(ModelState.from_model(Publisher))
project_state.add_model(ModelState.from_model(Book))
project_state.add_model(ModelState.from_model(Magazine))
self.assertEqual(len(project_state.apps.get_models()), 4)
# now make an invalid one with a ForeignKey
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Book))
msg = (
"The field migrations.Book.author was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model "
"'author'.\n"
"The field migrations.Book.publisher was declared with a lazy reference "
"to 'migrations.publisher', but app 'migrations' doesn't provide model "
"'publisher'."
)
with self.assertRaisesMessage(ValueError, msg):
project_state.apps
# And another with ManyToManyField.
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Magazine))
msg = (
"The field migrations.Magazine.authors was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model "
"'author'.\n"
"The field migrations.Magazine_authors.author was declared with a lazy "
"reference to 'migrations.author', but app 'migrations' doesn't provide "
"model 'author'."
)
with self.assertRaisesMessage(ValueError, msg):
project_state.apps
# And now with multiple models and multiple fields.
project_state.add_model(ModelState.from_model(Book))
msg = (
"The field migrations.Book.author was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model "
"'author'.\n"
"The field migrations.Book.publisher was declared with a lazy reference "
"to 'migrations.publisher', but app 'migrations' doesn't provide model "
"'publisher'.\n"
"The field migrations.Magazine.authors was declared with a lazy reference "
"to 'migrations.author', but app 'migrations' doesn't provide model "
"'author'.\n"
"The field migrations.Magazine_authors.author was declared with a lazy "
"reference to 'migrations.author', but app 'migrations' doesn't provide "
"model 'author'."
)
with self.assertRaisesMessage(ValueError, msg):
project_state.apps
def test_reference_mixed_case_app_label(self):
new_apps = Apps()
class Author(models.Model):
class Meta:
app_label = "MiXedCase_migrations"
apps = new_apps
class Book(models.Model):
author = models.ForeignKey(Author, models.CASCADE)
class Meta:
app_label = "MiXedCase_migrations"
apps = new_apps
class Magazine(models.Model):
authors = models.ManyToManyField(Author)
class Meta:
app_label = "MiXedCase_migrations"
apps = new_apps
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Author))
project_state.add_model(ModelState.from_model(Book))
project_state.add_model(ModelState.from_model(Magazine))
self.assertEqual(len(project_state.apps.get_models()), 3)
def test_real_apps(self):
"""
Including real apps can resolve dangling FK errors.
This test relies on the fact that contenttypes is always loaded.
"""
new_apps = Apps()
class TestModel(models.Model):
ct = models.ForeignKey("contenttypes.ContentType", models.CASCADE)
class Meta:
app_label = "migrations"
apps = new_apps
# If we just stick it into an empty state it should fail
project_state = ProjectState()
project_state.add_model(ModelState.from_model(TestModel))
with self.assertRaises(ValueError):
project_state.apps
# If we include the real app it should succeed
project_state = ProjectState(real_apps={"contenttypes"})
project_state.add_model(ModelState.from_model(TestModel))
rendered_state = project_state.apps
self.assertEqual(
len(
[
x
for x in rendered_state.get_models()
if x._meta.app_label == "migrations"
]
),
1,
)
def test_real_apps_non_set(self):
with self.assertRaises(AssertionError):
ProjectState(real_apps=["contenttypes"])
def test_ignore_order_wrt(self):
"""
Makes sure ProjectState doesn't include OrderWrt fields when
making from existing models.
"""
new_apps = Apps()
class Author(models.Model):
name = models.TextField()
class Meta:
app_label = "migrations"
apps = new_apps
class Book(models.Model):
author = models.ForeignKey(Author, models.CASCADE)
class Meta:
app_label = "migrations"
apps = new_apps
order_with_respect_to = "author"
# Make a valid ProjectState and render it
project_state = ProjectState()
project_state.add_model(ModelState.from_model(Author))
project_state.add_model(ModelState.from_model(Book))
self.assertEqual(
list(project_state.models["migrations", "book"].fields),
["id", "author"],
)
def test_modelstate_get_field_order_wrt(self):
new_apps = Apps()
class Author(models.Model):
name = models.TextField()
class Meta:
app_label = "migrations"
apps = new_apps
class Book(models.Model):
author = models.ForeignKey(Author, models.CASCADE)
class Meta:
app_label = "migrations"
apps = new_apps
order_with_respect_to = "author"
model_state = ModelState.from_model(Book)
order_wrt_field = model_state.get_field("_order")
self.assertIsInstance(order_wrt_field, models.ForeignKey)
self.assertEqual(order_wrt_field.related_model, "migrations.author")
def test_modelstate_get_field_no_order_wrt_order_field(self):
new_apps = Apps()
class HistoricalRecord(models.Model):
_order = models.PositiveSmallIntegerField()
class Meta:
app_label = "migrations"
apps = new_apps
model_state = ModelState.from_model(HistoricalRecord)
order_field = model_state.get_field("_order")
self.assertIsNone(order_field.related_model)
self.assertIsInstance(order_field, models.PositiveSmallIntegerField)
def test_manager_refer_correct_model_version(self):
"""
#24147 - Managers refer to the correct version of a
historical model
"""
project_state = ProjectState()
project_state.add_model(
ModelState(
app_label="migrations",
name="Tag",
fields=[
("id", models.AutoField(primary_key=True)),
("hidden", models.BooleanField()),
],
managers=[
("food_mgr", FoodManager("a", "b")),
("food_qs", FoodQuerySet.as_manager()),
],
)
)
old_model = project_state.apps.get_model("migrations", "tag")
new_state = project_state.clone()
operation = RemoveField("tag", "hidden")
operation.state_forwards("migrations", new_state)
new_model = new_state.apps.get_model("migrations", "tag")
self.assertIsNot(old_model, new_model)
self.assertIs(old_model, old_model.food_mgr.model)
self.assertIs(old_model, old_model.food_qs.model)
self.assertIs(new_model, new_model.food_mgr.model)
self.assertIs(new_model, new_model.food_qs.model)
self.assertIsNot(old_model.food_mgr, new_model.food_mgr)
self.assertIsNot(old_model.food_qs, new_model.food_qs)
self.assertIsNot(old_model.food_mgr.model, new_model.food_mgr.model)
self.assertIsNot(old_model.food_qs.model, new_model.food_qs.model)
def test_choices_iterator(self):
"""
#24483 - ProjectState.from_apps should not destructively consume
Field.choices iterators.
"""
new_apps = Apps(["migrations"])
choices = [("a", "A"), ("b", "B")]
class Author(models.Model):
name = models.CharField(max_length=255)
choice = models.CharField(max_length=255, choices=iter(choices))
class Meta:
app_label = "migrations"
apps = new_apps
ProjectState.from_apps(new_apps)
choices_field = Author._meta.get_field("choice")
self.assertEqual(list(choices_field.choices), choices)
class StateRelationsTests(SimpleTestCase):
def get_base_project_state(self):
new_apps = Apps()
class User(models.Model):
class Meta:
app_label = "tests"
apps = new_apps
class Comment(models.Model):
text = models.TextField()
user = models.ForeignKey(User, models.CASCADE)
comments = models.ManyToManyField("self")
class Meta:
app_label = "tests"
apps = new_apps
class Post(models.Model):
text = models.TextField()
authors = models.ManyToManyField(User)
class Meta:
app_label = "tests"
apps = new_apps
project_state = ProjectState()
project_state.add_model(ModelState.from_model(User))
project_state.add_model(ModelState.from_model(Comment))
project_state.add_model(ModelState.from_model(Post))
return project_state
def test_relations_population(self):
tests = [
(
"add_model",
[
ModelState(
app_label="migrations",
name="Tag",
fields=[("id", models.AutoField(primary_key=True))],
),
],
),
("remove_model", ["tests", "comment"]),
("rename_model", ["tests", "comment", "opinion"]),
(
"add_field",
[
"tests",
"post",
"next_post",
models.ForeignKey("self", models.CASCADE),
True,
],
),
("remove_field", ["tests", "post", "text"]),
("rename_field", ["tests", "comment", "user", "author"]),
(
"alter_field",
[
"tests",
"comment",
"user",
models.IntegerField(),
True,
],
),
]
for method, args in tests:
with self.subTest(method=method):
project_state = self.get_base_project_state()
getattr(project_state, method)(*args)
# ProjectState's `_relations` are populated on `relations` access.
self.assertIsNone(project_state._relations)
self.assertEqual(project_state.relations, project_state._relations)
self.assertIsNotNone(project_state._relations)
def test_add_model(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
self.assertEqual(
list(project_state.relations["tests", "comment"]),
[("tests", "comment")],
)
self.assertNotIn(("tests", "post"), project_state.relations)
def test_add_model_no_relations(self):
project_state = ProjectState()
project_state.add_model(
ModelState(
app_label="migrations",
name="Tag",
fields=[("id", models.AutoField(primary_key=True))],
)
)
self.assertEqual(project_state.relations, {})
def test_add_model_other_app(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
project_state.add_model(
ModelState(
app_label="tests_other",
name="comment",
fields=[
("id", models.AutoField(primary_key=True)),
("user", models.ForeignKey("tests.user", models.CASCADE)),
],
)
)
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post"), ("tests_other", "comment")],
)
def test_remove_model(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
self.assertEqual(
list(project_state.relations["tests", "comment"]),
[("tests", "comment")],
)
project_state.remove_model("tests", "comment")
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "post")],
)
self.assertNotIn(("tests", "comment"), project_state.relations)
project_state.remove_model("tests", "post")
self.assertEqual(project_state.relations, {})
project_state.remove_model("tests", "user")
self.assertEqual(project_state.relations, {})
def test_rename_model(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
self.assertEqual(
list(project_state.relations["tests", "comment"]),
[("tests", "comment")],
)
related_field = project_state.relations["tests", "user"]["tests", "comment"]
project_state.rename_model("tests", "comment", "opinion")
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "post"), ("tests", "opinion")],
)
self.assertEqual(
list(project_state.relations["tests", "opinion"]),
[("tests", "opinion")],
)
self.assertNotIn(("tests", "comment"), project_state.relations)
self.assertEqual(
project_state.relations["tests", "user"]["tests", "opinion"],
related_field,
)
project_state.rename_model("tests", "user", "author")
self.assertEqual(
list(project_state.relations["tests", "author"]),
[("tests", "post"), ("tests", "opinion")],
)
self.assertNotIn(("tests", "user"), project_state.relations)
def test_rename_model_no_relations(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
related_field = project_state.relations["tests", "user"]["tests", "post"]
self.assertNotIn(("tests", "post"), project_state.relations)
# Rename a model without relations.
project_state.rename_model("tests", "post", "blog")
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "blog")],
)
self.assertNotIn(("tests", "blog"), project_state.relations)
self.assertEqual(
related_field,
project_state.relations["tests", "user"]["tests", "blog"],
)
def test_add_field(self):
project_state = self.get_base_project_state()
self.assertNotIn(("tests", "post"), project_state.relations)
# Add a self-referential foreign key.
new_field = models.ForeignKey("self", models.CASCADE)
project_state.add_field(
"tests",
"post",
"next_post",
new_field,
preserve_default=True,
)
self.assertEqual(
list(project_state.relations["tests", "post"]),
[("tests", "post")],
)
self.assertEqual(
project_state.relations["tests", "post"]["tests", "post"],
{"next_post": new_field},
)
# Add a foreign key.
new_field = models.ForeignKey("tests.post", models.CASCADE)
project_state.add_field(
"tests",
"comment",
"post",
new_field,
preserve_default=True,
)
self.assertEqual(
list(project_state.relations["tests", "post"]),
[("tests", "post"), ("tests", "comment")],
)
self.assertEqual(
project_state.relations["tests", "post"]["tests", "comment"],
{"post": new_field},
)
def test_add_field_m2m_with_through(self):
project_state = self.get_base_project_state()
project_state.add_model(
ModelState(
app_label="tests",
name="Tag",
fields=[("id", models.AutoField(primary_key=True))],
)
)
project_state.add_model(
ModelState(
app_label="tests",
name="PostTag",
fields=[
("id", models.AutoField(primary_key=True)),
("post", models.ForeignKey("tests.post", models.CASCADE)),
("tag", models.ForeignKey("tests.tag", models.CASCADE)),
],
)
)
self.assertEqual(
list(project_state.relations["tests", "post"]),
[("tests", "posttag")],
)
self.assertEqual(
list(project_state.relations["tests", "tag"]),
[("tests", "posttag")],
)
# Add a many-to-many field with the through model.
new_field = models.ManyToManyField("tests.tag", through="tests.posttag")
project_state.add_field(
"tests",
"post",
"tags",
new_field,
preserve_default=True,
)
self.assertEqual(
list(project_state.relations["tests", "post"]),
[("tests", "posttag")],
)
self.assertEqual(
list(project_state.relations["tests", "tag"]),
[("tests", "posttag"), ("tests", "post")],
)
self.assertEqual(
project_state.relations["tests", "tag"]["tests", "post"],
{"tags": new_field},
)
def test_remove_field(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
# Remove a many-to-many field.
project_state.remove_field("tests", "post", "authors")
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment")],
)
# Remove a foreign key.
project_state.remove_field("tests", "comment", "user")
self.assertEqual(project_state.relations["tests", "user"], {})
def test_remove_field_no_relations(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
# Remove a non-relation field.
project_state.remove_field("tests", "post", "text")
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
def test_rename_field(self):
project_state = self.get_base_project_state()
field = project_state.models["tests", "comment"].fields["user"]
self.assertEqual(
project_state.relations["tests", "user"]["tests", "comment"],
{"user": field},
)
project_state.rename_field("tests", "comment", "user", "author")
renamed_field = project_state.models["tests", "comment"].fields["author"]
self.assertEqual(
project_state.relations["tests", "user"]["tests", "comment"],
{"author": renamed_field},
)
self.assertEqual(field, renamed_field)
def test_rename_field_no_relations(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
# Rename a non-relation field.
project_state.rename_field("tests", "post", "text", "description")
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
def test_alter_field(self):
project_state = self.get_base_project_state()
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
# Alter a foreign key to a non-relation field.
project_state.alter_field(
"tests",
"comment",
"user",
models.IntegerField(),
preserve_default=True,
)
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "post")],
)
# Alter a non-relation field to a many-to-many field.
m2m_field = models.ManyToManyField("tests.user")
project_state.alter_field(
"tests",
"comment",
"user",
m2m_field,
preserve_default=True,
)
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "post"), ("tests", "comment")],
)
self.assertEqual(
project_state.relations["tests", "user"]["tests", "comment"],
{"user": m2m_field},
)
def test_alter_field_m2m_to_fk(self):
project_state = self.get_base_project_state()
project_state.add_model(
ModelState(
app_label="tests_other",
name="user_other",
fields=[("id", models.AutoField(primary_key=True))],
)
)
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
self.assertNotIn(("tests_other", "user_other"), project_state.relations)
# Alter a many-to-many field to a foreign key.
foreign_key = models.ForeignKey("tests_other.user_other", models.CASCADE)
project_state.alter_field(
"tests",
"post",
"authors",
foreign_key,
preserve_default=True,
)
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment")],
)
self.assertEqual(
list(project_state.relations["tests_other", "user_other"]),
[("tests", "post")],
)
self.assertEqual(
project_state.relations["tests_other", "user_other"]["tests", "post"],
{"authors": foreign_key},
)
def test_many_relations_to_same_model(self):
project_state = self.get_base_project_state()
new_field = models.ForeignKey("tests.user", models.CASCADE)
project_state.add_field(
"tests",
"comment",
"reviewer",
new_field,
preserve_default=True,
)
self.assertEqual(
list(project_state.relations["tests", "user"]),
[("tests", "comment"), ("tests", "post")],
)
comment_rels = project_state.relations["tests", "user"]["tests", "comment"]
# Two foreign keys to the same model.
self.assertEqual(len(comment_rels), 2)
self.assertEqual(comment_rels["reviewer"], new_field)
# Rename the second foreign key.
project_state.rename_field("tests", "comment", "reviewer", "supervisor")
self.assertEqual(len(comment_rels), 2)
self.assertEqual(comment_rels["supervisor"], new_field)
# Remove the first foreign key.
project_state.remove_field("tests", "comment", "user")
self.assertEqual(comment_rels, {"supervisor": new_field})
class ModelStateTests(SimpleTestCase):
def test_custom_model_base(self):
state = ModelState.from_model(ModelWithCustomBase)
self.assertEqual(state.bases, (models.Model,))
def test_bound_field_sanity_check(self):
field = models.CharField(max_length=1)
field.model = models.Model
with self.assertRaisesMessage(
ValueError, 'ModelState.fields cannot be bound to a model - "field" is.'
):
ModelState("app", "Model", [("field", field)])
def test_sanity_check_to(self):
field = models.ForeignKey(UnicodeModel, models.CASCADE)
with self.assertRaisesMessage(
ValueError,
'ModelState.fields cannot refer to a model class - "field.to" does. '
"Use a string reference instead.",
):
ModelState("app", "Model", [("field", field)])
def test_sanity_check_through(self):
field = models.ManyToManyField("UnicodeModel")
field.remote_field.through = UnicodeModel
with self.assertRaisesMessage(
ValueError,
'ModelState.fields cannot refer to a model class - "field.through" does. '
"Use a string reference instead.",
):
ModelState("app", "Model", [("field", field)])
def test_sanity_index_name(self):
field = models.IntegerField()
options = {"indexes": [models.Index(fields=["field"])]}
msg = (
"Indexes passed to ModelState require a name attribute. <Index: "
"fields=['field']> doesn't have one."
)
with self.assertRaisesMessage(ValueError, msg):
ModelState("app", "Model", [("field", field)], options=options)
def test_fields_immutability(self):
"""
Rendering a model state doesn't alter its internal fields.
"""
apps = Apps()
field = models.CharField(max_length=1)
state = ModelState("app", "Model", [("name", field)])
Model = state.render(apps)
self.assertNotEqual(Model._meta.get_field("name"), field)
def test_repr(self):
field = models.CharField(max_length=1)
state = ModelState(
"app", "Model", [("name", field)], bases=["app.A", "app.B", "app.C"]
)
self.assertEqual(repr(state), "<ModelState: 'app.Model'>")
project_state = ProjectState()
project_state.add_model(state)
with self.assertRaisesMessage(
InvalidBasesError, "Cannot resolve bases for [<ModelState: 'app.Model'>]"
):
project_state.apps
def test_fields_ordering_equality(self):
state = ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
("name", models.CharField(max_length=100)),
("hidden", models.BooleanField()),
],
)
reordered_state = ModelState(
"migrations",
"Tag",
[
("id", models.AutoField(primary_key=True)),
# Purposely re-ordered.
("hidden", models.BooleanField()),
("name", models.CharField(max_length=100)),
],
)
self.assertEqual(state, reordered_state)
@override_settings(TEST_SWAPPABLE_MODEL="migrations.SomeFakeModel")
def test_create_swappable(self):
"""
Tests making a ProjectState from an Apps with a swappable model
"""
new_apps = Apps(["migrations"])
class Author(models.Model):
name = models.CharField(max_length=255)
bio = models.TextField()
age = models.IntegerField(blank=True, null=True)
class Meta:
app_label = "migrations"
apps = new_apps
swappable = "TEST_SWAPPABLE_MODEL"
author_state = ModelState.from_model(Author)
self.assertEqual(author_state.app_label, "migrations")
self.assertEqual(author_state.name, "Author")
self.assertEqual(list(author_state.fields), ["id", "name", "bio", "age"])
self.assertEqual(author_state.fields["name"].max_length, 255)
self.assertIs(author_state.fields["bio"].null, False)
self.assertIs(author_state.fields["age"].null, True)
self.assertEqual(
author_state.options,
{"swappable": "TEST_SWAPPABLE_MODEL", "indexes": [], "constraints": []},
)
self.assertEqual(author_state.bases, (models.Model,))
self.assertEqual(author_state.managers, [])
@override_settings(TEST_SWAPPABLE_MODEL="migrations.SomeFakeModel")
def test_create_swappable_from_abstract(self):
"""
A swappable model inheriting from a hierarchy:
concrete -> abstract -> concrete.
"""
new_apps = Apps(["migrations"])
class SearchableLocation(models.Model):
keywords = models.CharField(max_length=256)
class Meta:
app_label = "migrations"
apps = new_apps
class Station(SearchableLocation):
name = models.CharField(max_length=128)
class Meta:
abstract = True
class BusStation(Station):
bus_routes = models.CharField(max_length=128)
inbound = models.BooleanField(default=False)
class Meta(Station.Meta):
app_label = "migrations"
apps = new_apps
swappable = "TEST_SWAPPABLE_MODEL"
station_state = ModelState.from_model(BusStation)
self.assertEqual(station_state.app_label, "migrations")
self.assertEqual(station_state.name, "BusStation")
self.assertEqual(
list(station_state.fields),
["searchablelocation_ptr", "name", "bus_routes", "inbound"],
)
self.assertEqual(station_state.fields["name"].max_length, 128)
self.assertIs(station_state.fields["bus_routes"].null, False)
self.assertEqual(
station_state.options,
{
"abstract": False,
"swappable": "TEST_SWAPPABLE_MODEL",
"indexes": [],
"constraints": [],
},
)
self.assertEqual(station_state.bases, ("migrations.searchablelocation",))
self.assertEqual(station_state.managers, [])
@override_settings(TEST_SWAPPABLE_MODEL="migrations.SomeFakeModel")
def test_custom_manager_swappable(self):
"""
Tests making a ProjectState from unused models with custom managers
"""
new_apps = Apps(["migrations"])
class Food(models.Model):
food_mgr = FoodManager("a", "b")
food_qs = FoodQuerySet.as_manager()
food_no_mgr = NoMigrationFoodManager("x", "y")
class Meta:
app_label = "migrations"
apps = new_apps
swappable = "TEST_SWAPPABLE_MODEL"
food_state = ModelState.from_model(Food)
# The default manager is used in migrations
self.assertEqual([name for name, mgr in food_state.managers], ["food_mgr"])
self.assertEqual(food_state.managers[0][1].args, ("a", "b", 1, 2))
@isolate_apps("migrations", "django.contrib.contenttypes")
def test_order_with_respect_to_private_field(self):
class PrivateFieldModel(models.Model):
content_type = models.ForeignKey("contenttypes.ContentType", models.CASCADE)
object_id = models.PositiveIntegerField()
private = GenericForeignKey()
class Meta:
order_with_respect_to = "private"
state = ModelState.from_model(PrivateFieldModel)
self.assertNotIn("order_with_respect_to", state.options)
@isolate_apps("migrations")
def test_abstract_model_children_inherit_indexes(self):
class Abstract(models.Model):
name = models.CharField(max_length=50)
class Meta:
app_label = "migrations"
abstract = True
indexes = [models.Index(fields=["name"])]
class Child1(Abstract):
pass
class Child2(Abstract):
pass
child1_state = ModelState.from_model(Child1)
child2_state = ModelState.from_model(Child2)
index_names = [index.name for index in child1_state.options["indexes"]]
self.assertEqual(index_names, ["migrations__name_b0afd7_idx"])
index_names = [index.name for index in child2_state.options["indexes"]]
self.assertEqual(index_names, ["migrations__name_016466_idx"])
# Modifying the state doesn't modify the index on the model.
child1_state.options["indexes"][0].name = "bar"
self.assertEqual(Child1._meta.indexes[0].name, "migrations__name_b0afd7_idx")
@isolate_apps("migrations")
def test_explicit_index_name(self):
class TestModel(models.Model):
name = models.CharField(max_length=50)
class Meta:
app_label = "migrations"
indexes = [models.Index(fields=["name"], name="foo_idx")]
model_state = ModelState.from_model(TestModel)
index_names = [index.name for index in model_state.options["indexes"]]
self.assertEqual(index_names, ["foo_idx"])
@isolate_apps("migrations")
def test_from_model_constraints(self):
class ModelWithConstraints(models.Model):
size = models.IntegerField()
class Meta:
constraints = [
models.CheckConstraint(check=models.Q(size__gt=1), name="size_gt_1")
]
state = ModelState.from_model(ModelWithConstraints)
model_constraints = ModelWithConstraints._meta.constraints
state_constraints = state.options["constraints"]
self.assertEqual(model_constraints, state_constraints)
self.assertIsNot(model_constraints, state_constraints)
self.assertIsNot(model_constraints[0], state_constraints[0])
class RelatedModelsTests(SimpleTestCase):
def setUp(self):
self.apps = Apps(["migrations.related_models_app"])
def create_model(
self, name, foreign_keys=[], bases=(), abstract=False, proxy=False
):
test_name = "related_models_app"
assert not (abstract and proxy)
meta_contents = {
"abstract": abstract,
"app_label": test_name,
"apps": self.apps,
"proxy": proxy,
}
meta = type("Meta", (), meta_contents)
if not bases:
bases = (models.Model,)
body = {
"Meta": meta,
"__module__": "__fake__",
}
fname_base = fname = "%s_%%d" % name.lower()
for i, fk in enumerate(foreign_keys, 1):
fname = fname_base % i
body[fname] = fk
return type(name, bases, body)
def assertRelated(self, model, needle):
self.assertEqual(
get_related_models_recursive(model),
{(n._meta.app_label, n._meta.model_name) for n in needle},
)
def test_unrelated(self):
A = self.create_model("A")
B = self.create_model("B")
self.assertRelated(A, [])
self.assertRelated(B, [])
def test_direct_fk(self):
A = self.create_model(
"A", foreign_keys=[models.ForeignKey("B", models.CASCADE)]
)
B = self.create_model("B")
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_direct_hidden_fk(self):
A = self.create_model(
"A", foreign_keys=[models.ForeignKey("B", models.CASCADE, related_name="+")]
)
B = self.create_model("B")
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_fk_through_proxy(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,), proxy=True)
C = self.create_model("C", bases=(B,), proxy=True)
D = self.create_model(
"D", foreign_keys=[models.ForeignKey("C", models.CASCADE)]
)
self.assertRelated(A, [B, C, D])
self.assertRelated(B, [A, C, D])
self.assertRelated(C, [A, B, D])
self.assertRelated(D, [A, B, C])
def test_nested_fk(self):
A = self.create_model(
"A", foreign_keys=[models.ForeignKey("B", models.CASCADE)]
)
B = self.create_model(
"B", foreign_keys=[models.ForeignKey("C", models.CASCADE)]
)
C = self.create_model("C")
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_two_sided(self):
A = self.create_model(
"A", foreign_keys=[models.ForeignKey("B", models.CASCADE)]
)
B = self.create_model(
"B", foreign_keys=[models.ForeignKey("A", models.CASCADE)]
)
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_circle(self):
A = self.create_model(
"A", foreign_keys=[models.ForeignKey("B", models.CASCADE)]
)
B = self.create_model(
"B", foreign_keys=[models.ForeignKey("C", models.CASCADE)]
)
C = self.create_model(
"C", foreign_keys=[models.ForeignKey("A", models.CASCADE)]
)
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,))
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_nested_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,))
C = self.create_model("C", bases=(B,))
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_multiple_bases(self):
A = self.create_model("A")
B = self.create_model("B")
C = self.create_model(
"C",
bases=(
A,
B,
),
)
self.assertRelated(A, [B, C])
self.assertRelated(B, [A, C])
self.assertRelated(C, [A, B])
def test_multiple_nested_bases(self):
A = self.create_model("A")
B = self.create_model("B")
C = self.create_model(
"C",
bases=(
A,
B,
),
)
D = self.create_model("D")
E = self.create_model("E", bases=(D,))
F = self.create_model(
"F",
bases=(
C,
E,
),
)
Y = self.create_model("Y")
Z = self.create_model("Z", bases=(Y,))
self.assertRelated(A, [B, C, D, E, F])
self.assertRelated(B, [A, C, D, E, F])
self.assertRelated(C, [A, B, D, E, F])
self.assertRelated(D, [A, B, C, E, F])
self.assertRelated(E, [A, B, C, D, F])
self.assertRelated(F, [A, B, C, D, E])
self.assertRelated(Y, [Z])
self.assertRelated(Z, [Y])
def test_base_to_base_fk(self):
A = self.create_model(
"A", foreign_keys=[models.ForeignKey("Y", models.CASCADE)]
)
B = self.create_model("B", bases=(A,))
Y = self.create_model("Y")
Z = self.create_model("Z", bases=(Y,))
self.assertRelated(A, [B, Y, Z])
self.assertRelated(B, [A, Y, Z])
self.assertRelated(Y, [A, B, Z])
self.assertRelated(Z, [A, B, Y])
def test_base_to_subclass_fk(self):
A = self.create_model(
"A", foreign_keys=[models.ForeignKey("Z", models.CASCADE)]
)
B = self.create_model("B", bases=(A,))
Y = self.create_model("Y")
Z = self.create_model("Z", bases=(Y,))
self.assertRelated(A, [B, Y, Z])
self.assertRelated(B, [A, Y, Z])
self.assertRelated(Y, [A, B, Z])
self.assertRelated(Z, [A, B, Y])
def test_direct_m2m(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField("B")])
B = self.create_model("B")
self.assertRelated(A, [A.a_1.rel.through, B])
self.assertRelated(B, [A, A.a_1.rel.through])
def test_direct_m2m_self(self):
A = self.create_model("A", foreign_keys=[models.ManyToManyField("A")])
self.assertRelated(A, [A.a_1.rel.through])
def test_intermediate_m2m_self(self):
A = self.create_model(
"A", foreign_keys=[models.ManyToManyField("A", through="T")]
)
T = self.create_model(
"T",
foreign_keys=[
models.ForeignKey("A", models.CASCADE),
models.ForeignKey("A", models.CASCADE),
],
)
self.assertRelated(A, [T])
self.assertRelated(T, [A])
def test_intermediate_m2m(self):
A = self.create_model(
"A", foreign_keys=[models.ManyToManyField("B", through="T")]
)
B = self.create_model("B")
T = self.create_model(
"T",
foreign_keys=[
models.ForeignKey("A", models.CASCADE),
models.ForeignKey("B", models.CASCADE),
],
)
self.assertRelated(A, [B, T])
self.assertRelated(B, [A, T])
self.assertRelated(T, [A, B])
def test_intermediate_m2m_extern_fk(self):
A = self.create_model(
"A", foreign_keys=[models.ManyToManyField("B", through="T")]
)
B = self.create_model("B")
Z = self.create_model("Z")
T = self.create_model(
"T",
foreign_keys=[
models.ForeignKey("A", models.CASCADE),
models.ForeignKey("B", models.CASCADE),
models.ForeignKey("Z", models.CASCADE),
],
)
self.assertRelated(A, [B, T, Z])
self.assertRelated(B, [A, T, Z])
self.assertRelated(T, [A, B, Z])
self.assertRelated(Z, [A, B, T])
def test_intermediate_m2m_base(self):
A = self.create_model(
"A", foreign_keys=[models.ManyToManyField("B", through="T")]
)
B = self.create_model("B")
S = self.create_model("S")
T = self.create_model(
"T",
foreign_keys=[
models.ForeignKey("A", models.CASCADE),
models.ForeignKey("B", models.CASCADE),
],
bases=(S,),
)
self.assertRelated(A, [B, S, T])
self.assertRelated(B, [A, S, T])
self.assertRelated(S, [A, B, T])
self.assertRelated(T, [A, B, S])
def test_generic_fk(self):
A = self.create_model(
"A",
foreign_keys=[
models.ForeignKey("B", models.CASCADE),
GenericForeignKey(),
],
)
B = self.create_model(
"B",
foreign_keys=[
models.ForeignKey("C", models.CASCADE),
],
)
self.assertRelated(A, [B])
self.assertRelated(B, [A])
def test_abstract_base(self):
A = self.create_model("A", abstract=True)
B = self.create_model("B", bases=(A,))
self.assertRelated(A, [B])
self.assertRelated(B, [])
def test_nested_abstract_base(self):
A = self.create_model("A", abstract=True)
B = self.create_model("B", bases=(A,), abstract=True)
C = self.create_model("C", bases=(B,))
self.assertRelated(A, [B, C])
self.assertRelated(B, [C])
self.assertRelated(C, [])
def test_proxy_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,), proxy=True)
self.assertRelated(A, [B])
self.assertRelated(B, [])
def test_nested_proxy_base(self):
A = self.create_model("A")
B = self.create_model("B", bases=(A,), proxy=True)
C = self.create_model("C", bases=(B,), proxy=True)
self.assertRelated(A, [B, C])
self.assertRelated(B, [C])
self.assertRelated(C, [])
def test_multiple_mixed_bases(self):
A = self.create_model("A", abstract=True)
M = self.create_model("M")
P = self.create_model("P")
Q = self.create_model("Q", bases=(P,), proxy=True)
Z = self.create_model("Z", bases=(A, M, Q))
# M has a pointer O2O field p_ptr to P
self.assertRelated(A, [M, P, Q, Z])
self.assertRelated(M, [P, Q, Z])
self.assertRelated(P, [M, Q, Z])
self.assertRelated(Q, [M, P, Z])
self.assertRelated(Z, [M, P, Q])
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